Low Profile Transfer Conveyor for Use with Conveyor Systems

ABSTRACT

The low profile transfer conveyor bridges gaps between terminal ends of contiguous multi segment conveyors and provides a driven belt bridge with a length that approximately bridges the space between the flat surfaces of conveyor belt segments of the multi segment conveyors and has a low profile which minimizes any unsupported distance across which articles must cross between conveyor belt segments by providing a small continuous section of driven conveyor belt traversing a flat surface bounded on two sides by small radius edges so the transfer conveyor edges extend almost to the flat surface of the belt segments on opposite sides of the gap that it bridges. At its ends, the belt of the transfer conveyor is driven by one or more drive pulleys.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation in part of U.S. application Ser. No.14/797,138 filed Jul. 12, 2015, issued as U.S. Pat. No. 9,327,915, thedisclosure of which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Conveyor systems are routinely used to move articles in industrialsettings, such as in package handling or in food preparation. Theseconveyor systems typically consist of a long linear length of belttightened between two transverse rollers (with transverse or laterallyin all cases defined as the perpendicular to the movement of the beltassociated therewith) at least one of which drives the belt that movesthe articles placed thereon along the path of the belt.

The conveyor systems typically consist of multiple segments of drivebelts that carry articles. As the transported articles pass from oneconveyor segment to another they must cross a gap between the beltscreated by the rollers between which the belt of the conveyor beltsegment is stretched. The size of the gap between the belts depends onthe size of the rollers at the terminal ends of the belt. The larger theroller diameter at terminal ends of contiguous belt segments, thegreater the discontinuity between the belt segments. The geometry of therollers and the necessity to space different belt segments apart cancreate the opportunity for a significant vertical drop of articlescarried by a belt segment as the articles cross the gap to the next beltsegment. When an article is relatively small compared to size of the gapit must cross, the article can tip or, worse yet, tumble, as it passesfrom one belt segment to the next.

Various forms of bridging assemblies are used to prevent the tipping andtumbling of articles as they pass from one conveyor segment to the next.One type of gap filler comprises solid plate sections that bridge thegap to minimize the tumbling of articles as they pass from one conveyorsegment to the next. A disadvantage of this type of filler is thatarticles tend to drag across the top surface or need to be pushed by anadjacent article before moving from one conveyor segment to the next.The dragging of articles over such a plate section poses significantproblems where the conveyor segment is required to transport articles ata uniform spacing.

Another type of bridging assembly consists of a much smaller roller orroller belt assembly juxtaposed between the two belt segments. Thesmaller roller will, to some extent, reduce the potential for downwarddropping or tumbling of the article as it passes from one belt to thenext but it still does not eliminate the possibility of articlestumbling or tipping.

SUMMARY OF THE INVENTION

According to the invention there is provided transfer conveyor whichbridges gaps between terminal roller ends of contiguous multi segment,large conveyors and provides a driven belt bridge having a length forconveying articles that bridges approximately the full space betweenconveyor belt segments wherein the driven belt or transfer belt has alow profile adjacent to the ends of the large conveyor therebyminimizing any gap between the large conveyors and their terminalrollers. In this manner the transfer conveyor conveys articles betweenthe conveyor segments and prevents their tipping or tumbling. Thetransfer conveyor may also receive or deliver articles to or from alarger conveyor.

The transfer conveyor has a minor axis that corresponds to the directionthat it transports articles and a major axis perpendicular to the minoraxis. In all of its arrangements and applications the distance that thetransport conveyor transports articles (hereinafter the transportdistance) will be less than the distance between the ends of theconveyor in the direction of its major axis. The distance across thebelt along its major axis upon which articles may be placed is referredto as it transfer dimension. All use of the term “transverse” refers toa direction parallel to the major axis.

The transfer conveyor terminates at its distal end (defined as its endthat is parallel to the major axis) with a belt guide having a very thinoutermost edge (or the thin edge) that because of minimal thickness canbe located adjacent to the conveying surface of the large conveyor(hereinafter referred to as main conveyor.) The adjacent location of thethin edge refers to a location as near as possible to the conveyingsurface of the main conveyor.

In most arrangements the transfer belt has a transverse length greaterthan its transfer dimension to provide an extended end that serves as adrive section A driving force imparted drive section moves the belt inthe direction minor axis and produces continuous linear motion of thetransfer belt. Using the extended end as a drive section to impart thedriving force to transfer belt permits the use of the thin edge at theof the transfer conveyor. The combination of the extended end fordriving the transfer belt and the very thin outermost edge achieves thenecessary minimization of any gap between the terminal roller of themain conveyor and the thin outermost edge of the transfer conveyor.Minimizing this gap prevent any the tipping or tumbling of conveyedarticles as they pass onto and/or off of a main conveyor.

The transfer conveyor may take many forms and serve a variety ofapplications. The transfer conveyor can provide a flat or arcuatesurface that receives articles from and/or delivers articles to the beltof a main conveyor that with respect to the transfer conveyor is muchlarger overall. An arcuate surface may be convex or concave. In itsusual form and application the transfer conveyor fills the gap betweenlarge, highly rounded belt ends of adjoining sections of main conveyorscreated by the large radius of the terminal rollers at their terminalends. Typically the transfer conveyor provides a moving a flat surfacethat receives articles from an upstream main conveyor and delivers themto a downstream main conveyor. In other applications the articles may beplaced directly upon the transfer conveyor and then delivered to a mainconveyor or may receive articles from a transfer conveyor and deliverthe articles directly to a processing or packaging step. In certainarrangements the transfer dimension of the transfer conveyor may begreater or smaller than the conveying dimension, i.e. the length acrossthe main conveyor over which articles may be spread transversely.

The thin outermost edge of the transfer conveyor will have a thicknessthat is much less than the radius of the adjacent end roller of thelarge conveyor. The thickness of the thin edge will be less than 25% ofthe radius of any adjacent terminal roller, preferably less than 10% ofthe radius of the terminal roller and more preferably less than 5% ofthe radius of the terminal roller. In most cases the thin edge is asnear a knife-like as possible while still permitting the continuousmovement of the transfer belt over the thin edge. In most cases the thinedge will be in the form of a nose that defines a small radius and ismade of a low friction material. This radius will typically range insize from 1/16 to ½ inch and preferably 1/16 to ¼ inch. The nose maycomprise a separate structural element of the transfer conveyor or beltguide. In some cases small transversely extending rollers or bearingsmay be incorporated into the nose to reduce friction as the transferbelt moves over the thin edge or nose.

A variety of suitable drive assemblies can impart the necessarycontinuous, linear motion to the transfer belt. However, suitablemethods cannot use any large rollers at the thin edge of the transferconveyor. One method of imparting linear motion to the transfer beltuses a transfer belt having a greater total transverse length than thewidth the transfer dimension provided by the transfer belt so at leastone end of the transfer belt extends transversely beyond the portion ofthe belt surface that receives the conveyed articles and transverselybeyond the thin edge over which it passes. This arrangement provides atleast one extended end of the transfer conveyor to transition in shapeto provide a relatively large interior cross section that can receive adrive roller or a belt pulley. In one arrangement a pair of belt pulleyshaving a larger diameter than the thin edges of the transfer conveyoreach contact the inside of the transfer belt at a drive section. Atleast one of the belt pulleys serves as a drive pulley and drives thelinear motion of the belt. Such pulleys may be provided in the drivesection at one end of the transfer belt or the transfer belt may have adrive section on both sides to receive belt pulleys for guiding ordriving the transfer belt. Thus in one form the transfer belt comprisesa short continuous belt segment having a uniform length stretched overthe lateral distance between the thin edges and the transfer belt canextend in the transverse direction past its normal transfer dimension toprovide drive sections from the extended section of the transfer beltthat contacts a pair of belt pulleys to cause translation of the beltacross the transport surface and the thin edges. The term continuousbelt refers to a belt that is made in the form of a loop so that it hasan endless configuration as move over a surface. In another form thetransfer belt may have a greater continuous length at the drive sectionto accommodate larger belt pulley for driving the transfer belt. In thiscase the transfer belt has a longer path of travel at its ends than inits middle. In either case, extending the transfer belt past the normalconveyance dimension of the main conveyor belts, provides a section ofbelt for imparting motion to the transfer belt at a location away fromthe curvilinear portion of the large conveyor belt segment. Where thedrive sections of the transfer belt extend past the transfer dimension,the belt pulleys may have a larger diameter than the thickness of thetransfer plate that supports the transfer belt. By locating the beltpulleys where they can have a larger diameter than the short radiusedges or even the transfer plate itself, a belt pulley/drive roller canprovide the necessary contact and tension to maintain steady continuousmovement of the transfer belt on the transport conveyor. The ability tomaintain steady continuous movement allows the transfer belt to matchthe belt speed of the main conveyor or main conveyors that it bridges.

The pulleys, drive rollers or other devices that control the speed ofthe transfer belt may be timed in any manner that will keep the transferbelt moving at a desired speed with respect to the belt speeds of themain conveyors between which it is located. The speed of the transferconveyor belt will typically match the speed of the belt of the largeconveyors. In some special cases it may be desired to use the transferconveyor to provide a speed transition where the belts of a mainconveyors move at different speeds and the belt of the transfer conveyormoves at an intermediate speed with respect to the difference in beltspeed between the two main conveyors.

Any type of drive input may be used to turn pulleys or drive rollersthat drive the transfer belt in unison at a desired speed. A simplemethod is to directly link an end pulley of a main conveyor with a drivepulley of the transfer conveyor by the use of gearing or a drive belt.Sizing of the gears or pulleys for the drive belt can time the relativerotation of the pulley/drive roller as desired to effect the desiredlinear motion of the transfer belt. Another alternative is to provide anindependent drive for a transfer belt pulley/drive roller that has itsown speed control for adjusting the linear motion of the transfer belt.

Accordingly in a broad form this invention is a transfer conveyor havinga major axis and perpendicularly oriented minor axis that comprises atransfer plate having two belt guides spaced apart from each other in aparallel arrangement by a distance along the minor axis comprising atransport distance with the belt guides located on opposite sides of thetransfer conveyor. Each belt guide has an outermost edge over itstransverse length and the transfer plate has a depth over its centralportion that is less than the distance between the outermost edges. Acontinuous transfer belt is suspended between the belt guides andarranged for continuous travel over the belt guides with an upwardlyoriented surface that provides a transport surface that extending in atransverse direction to define a transversely extending transferdimension across which articles may be conveyed. The transfer belt has adrive section located at at least one of its ends upon which at leastone drive roller is arranged to impart motion to the transfer belt inthe minor axis direction of the transfer conveyor. The drive roller hasa diameter greater than the outermost edge, is located closer to thecenter of the transfer surface than the outermost edge and is in contactwith an engagement surface that is fixed to or integral with the drivesection of the transfer belt to cause the transfer belt to translateover the outermost edges for conveying articles across the transportsurface.

In a more specific arrangement of the above broad form the transfer belttransitions in shape from relatively flat at its center to circular at adrive section. The transfer plate defines the shape of the belt by alsotransitioning from relatively flat at its center to circular at its endthat supports the drive section of the transfer belt. The transfer belthas an engagement surface in circular form about its drive section uponwhich a drive roller acts to cause the transfer belt to translate overthe outermost edges. To facilitate placement of the transfer belt overthe transfer surface may have section that separate and reattach forplacement of the belt over the flat to circular transition of thetransfer plate.

In another form the invention comprises a transfer conveyor for bridgingthe gap between the terminal ends of contiguous multi segment, largeconveyors that loop a conveyor belt segment over at least one end rollerto transport articles on the conveyors. The transfer conveyor comprisestwo belt tensioners spaced apart from each other in a parallelarrangement by a distance comprising a transport distance and located onopposite sides of the transfer conveyor with each tensioner having anoutermost edge over its transverse length and the outermost edge havingan edge thickness that is less than the radius of the end roller. Atransfer belt is suspended between the belt tensioners with an upwardlyfacing belt surface that provides a conveying surface. The transfer beltmay have a total transverse length of the belt tensioners to provide adrive section of the transfer belt located to at least one side of thebelt tensioners. The transfer conveyor also comprises a pair of pulleyshaving a diameter greater than the edge thickness and less than thediameter of the end roller that are in contact with the inner surface ofthe transfer belt at the drive section to impart tension thereon and atleast one of the pulleys comprises a drive pulley capable of moving thetransfer belt continually over the outermost edges to impart linearmotion to the transfer belt and convey articles between the multisegment large conveyors.

In yet another form the invention may comprise a transfer conveyorhaving a major axis and perpendicularly oriented minor axis comprising atransfer plate having two belt guides spaced apart from each other in aparallel arrangement by a distance along the minor axis comprising atransport distance with the belt guides located on opposite sides of thetransfer conveyor with each belt guide having an outermost edge over itstransverse length. Again the transfer plate has a depth over its centralportion that is less than the distance between the outermost edges. Acontinuous transfer belt suspended between the belt guides arranged forcontinuous travel over the belt guides has an upwardly oriented surfacethat provides a transport surface extending in a transverse direction todefine a transversely extending transfer dimension across which articlesmay be conveyed with said transfer belt having a drive section locatedat least one of its end. The transfer plate defines one or more pocketsat least one end for receiving a captured roller that extends partiallyin a transverse direction toward the center of the transfer plate.

Alternatively a series of pockets or a continuous groove may extendtransversely across the entire transport plate for receiving capturedroller segments or a continuous captured roller. Any of the capturedrollers may be a drive roller or a follower roller. The necessary motionmay be imparted to the belt via one or more captured drive roller, inwhich case it may not be necessary to have a drive section of the beltthat extends past the transfer dimension of the transfer belt. Where thetransfer belt does have an extended drive section, one or more driverollers located above or below the drive section may contact anengagement surface on the exterior of the transfer belt to impart thenecessary motion thereto. Where a drive roller cooperates with theexterior of the belt, an additional drive or follower may be positionedopposite the drive roller to balance any force exerted on the drivesection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 provides an exploded perspective view of the low profile transferconveyor for bridging multi segment conveyors of the present invention.

FIG. 2 provides an exploded perspective view of the low profile beltassembly of the low profile transfer conveyor for bridging multi segmentconveyors of the present invention showing timing belts with guideswhich are bonded onto the interior of each flared end of the continuousbelt of the belt assembly.

FIG. 3 provides an exploded perspective view of the low profile transferconveyor for bridging multi segment conveyors of the present inventionand shows the mechanical body or belt carrying assembly of the inventionin its assembled state..

FIG. 4 provides a perspective view of the low profile transfer conveyorfor bridging multi segment conveyors of the present invention in acompletely assembled state with the mechanical body or belt carryingassembly seated within an interior cavity of the continuous beltassembly of the conveyor.

FIG. 5 provides a cross sectional view through a middle section of thelow profile transfer conveyor for bridging multi segment conveyors ofthe present invention in its environment of use.

FIG. 6 provides a perspective view of the low profile transfer conveyorin its environment of use.

FIG. 7 provides an end view from the drive end of the low profiletransfer conveyor in its environment of use.

FIG. 8 shows a perspective view of another arrangement of the inventionfor driving the transfer belt.

FIG. 9 is am exploded perspective view of arrangement of FIG. 8 showingthe transfer belt removed from a transfer plate that retains thetransfer belt.

FIG. 10 shows the transfer conveyor of FIG. 8 in a position to transferarticles from one main conveyor to another main conveyor.

FIG. 11 is a perspective view of a transfer conveyor having a captureroller retained by the transfer plate.

FIG. 12 is an exploded view of the transfer conveyor of FIG. 11.

FIG. 13 is a section view taken at A-A of FIG. 11.

FIG. 14 is a section view taken at B-B of FIG. 13

FIG. 15 is an isometric view of a transfer conveyor with the with endportions of the transfer to show captured rollers that extend the fulltransverse length of the transfer conveyor.

FIG. 16 is an end view of the transfer conveyor of FIG. 15 with thetransfer belt removed.

FIG. 17 is a front view of the transfer conveyor of FIG. 15 with thetransfer belt removed.

FIG. 18 is a section view taken at A-A of FIG. 17.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The low profile transfer conveyor for bridging multi segment conveyorsof the present invention comprises a small low profile conveyor whichfills the gap between contiguous terminal end rollers of large conveyorthat typically the end radius of belt segment. The transfer conveyorprovides a driven belt bridge with a length that approximately bridgesthe space between terminal rollers of main conveyors and the beltsegments that typically roll about them. The transfer conveyor has a lowprofile which minimizes any unsupported distance across which articlesmust cross between conveyor belt segments. The low profile transferconveyor disclosed herein can transport conveyed articles across the gapbetween adjacent conveyor belt segments by providing a small continuoussection of transfer conveyor having a belt which is driven across abridging surface or transfer plate bounded on its two sides by smallradius edges. In this manner the length of the transfer conveyor canextend almost to the surface of each terminal roller or belt segment onopposite sides of the gap that it bridges. At its ends, the transferbelt of the transfer conveyor may be stretched between a pair of pulleyshaving a larger diameter than the small diameter edges or thin outermostedges of the transfer conveyor which are located adjacent to thebeginning of the curvilinear portion of the conveyor belt segment asdefined by its terminal roller.

The belt surface of the transfer conveyor of this invention may have ahorizontal or inclined orientation and may provide a flat or roundedsurface. In most cases the belt surface will have a horizontalorientation and provide a flat surface. For convenience the rest of thispreferred embodiment describes the transfer conveyor as having a flatsurface with a horizontal orientation, however the invention may bepracticed with a transfer conveyor oriented at any suitable angle toretain conveyed articles thereon with a flat or surface profile thatsuits the particular application.

Turning now to the Figures, it will be seen from FIGS. 1-3 that thetransfer conveyor of the present invention, hereinafter referred to astransfer conveyor 10, comprises a first assembly 12 which may be definedas a low profile belt assembly 12. A transfer belt 14 of the beltassembly 12 is preferably made of light weight, food grade belting andwill be seen to be continuous and to have the upper surface 13 and lowersurface 15 configured into a relatively flat arrangement over a centralbase portion 32 that provides a transfer plate. The spacing between theupper and lower surfaces of the belt increase into an oval configurationby outwardly flaring the central portion of the transfer belt at itsoutboard ends 16 to provide drive sections. Within each of these drivesections 16 is bonded a an engagement surface in the form of a timingbelt 18 including at least one guide section 20 along an interiorsurface 22 thereof, which at least one guide section 20 may be of a landin the form V-guide configuration, though this should not be construedas limiting. The at least one guide section 20 is useful for properalignment of the timing belt 18 relative to a second functional assembly30 of the conveyor 10 which may be defined as the mechanical body orbelt carrying assembly 30.

FIGS. 1 and 3 provide exploded perspective views of the transferconveyor 10 including the belt assembly 12 as defined above and themechanical body or belt carrying assembly 30. It will be understood thatthe belt carrying assembly 30 is assembled and located within theconfines of the continuous belt 14 of the belt assembly 12. The beltcarrying assembly 30 includes a base portion 32 in the form of atransfer plate which is of a width in a direction transfer to themovement of the belt that is greater of the belt assembly 12 and carriesthereon the functional or mechanical structures of the transfer conveyor10. In this respect, it will be seen that the base portion 32 includestwo narrow end flanges 34 and 35 and further includes two elongategrooves 36, one within each elongate side edge 38 of a wider centralportion 40 of the base portion 32.

The elongate grooves 36 along each side edge 38 of a wider centralportion 40 each engage, in a tongue in groove manner, a static nosepiece 42 the provides the belt, preferably made of a thermoplastic witha laterally outwardly narrowing lower outer peripheral edge 44 whichacts as a further belt guide along the length of the belt 14 whichtravels there across as will be further described herein below. Eachnose piece 42 may further include a cylindrical bore 47 extendinglengthwise through the nose piece along a laterally extended inner edge48 thereof through at least one of which extends a drive shaft 50, thecylindrical bore 47 acting as a bearing surface for the at least onedrive shaft 50, as well as allowing for lateral dual drives, if desired.

The narrow end flanges 34 and 35 are each configured in sections, afirst section 52 of each of which provides a belt tensioner for movingon or both of the nose pieces outwardly. As shown in the figures thebelt tensioner may take the form of a low profile cam positionedcentrally thereupon a low profile cam action belt tensioner 54 which ismanually settable to maintain desired tension on the belt 14. To oneside of one tensioner 54 on end flange 35 is fixedly mounted a dualdrive pulley 56 which aids in belt 14 tracking and substantiallyeliminates twisting of belt 14. An inner end nub 58 of drive pulley 56is fixedly engaged to a corresponding end of the drive shaft 50extending through the cylindrical bore 47 in a nose piece 52. Drivepulley 56 is also provided with a drive shaft nub 62 which can bepowered by any suitable means, such as direct belt drive, slave drive,etc. At the opposite end of the drive shaft 50, fixedly engaged tosection 52 on end flange 34 is a driven pulley 60 which is driven by thedrive shaft 50 to which it is engaged at an inner end nub 62 thereofAlso engaged to section 52 of both end flanges 34 and 35, on an oppositeside of the cam tensioner 54, across from the pulleys 56 and 50 aremounted free spinning pulleys 66 which are mounted slidably withinparallel tracks 68 for same inwardly of side edges 70 of the sections52. They are slidably mounted so that the cam tensioner 54 can be setmanually to act upon them as necessary to maintain appropriate tensionon the belt 14 of belt assembly 12. Of course, they are mounted inalignment with the respective cooperating pulleys 56 and 60 as well.Thus, it will be understood that when the transfer conveyor 10 is fullyassembled, the V-configured guide 20 of the timing belt 18 cooperateswith a corresponding groove 71 on each of the pulleys 56, 60 and 66,maintaining proper tracking of the belt 14 and substantially eliminatetwisting thereof. Each of the end flanges 34, 35 further includes aterminal portion 72 having a pair of laterally linearly aligned slots 74therein which are provided. for engaging the transfer conveyor 10 tosupport structure 75 thereunder, as described in connection with FIGS. 6and 7.

FIG. 4 illustrates the low profile bridging transfer conveyor 10constructed and in its functional state, with the mechanical body orbelt carrying assembly 30 appropriately seated within the continuousbelt 14 of the belt assembly 12. In this configuration it is ready foruse in bridging a gap 77 between contiguous ends 79 of multi sectionalconveyor belts 80, as best illustrated in FIG. 5. It will be understoodthat the ends 79 are curvilinear, as defined by large diameter terminalrollers 81.

FIG. 5 illustrates a simplified lateral cross sectional view of thetransfer conveyor 10 in its working environment, showing a low profilecenter section 76 thereof between the two flared outboard ends 16 beingmaintained substantially at the same level as the upper surface of theconveyor belts 80, in this case the same horizontal level, as thecontiguous ends 79 of multi sectional conveyor belts 80 traveling aroundthe large diameter terminal rollers 81. It will also be best seen herethat the outwardly undercut lateral edge areas 44 of the side flanges 42of the mechanical body 30 create a small radius for the low profilecenter section 76 along its lateral edges to allow for a smoothtransition of product thereacross and onto the contiguous end portion 79of next conveyor belt 80. It will also be understood that no structuressuch as drive rollers, sprockets, etc. are positioned beneath thetransfer conveyor 10 in its preferred embodiment. It will also beunderstood by those skilled in the art that the low profile conveyor 10is capable of bidirectional travel.

Turning now to FIG. 6, it will be seen that the low profile centersection 76 of transfer conveyor 10 extends substantially along an entireconveying dimension or width of contiguous belts 80 between which it isto transfer items from one to another over gap 77 there between. It willfurther be seen that the flared portion of outboard drive sections 16 ofthe transfer conveyor 10 extend beyond side edges 82 of the belts 80,acting somewhat like stop member shoulders to aid in maintaining productin travel there-along. Further, it will be understood that in apreferred embodiment, the transfer conveyor 10 may be fixed in positionrelative to the belts .80 which it is bridging. In this respect, framesections 84 of the belts 80 may be engaged to a support member 86 ofsuitable configuration to which the transfer conveyor 10 may be engaged,preferably by threaded rods, bolts 88 or the like which allow foradjustment of height relative to the level of the belts 80. As there aremany suitable embodiments for engagement of the transfer conveyor 10between belts 80, the embodiment illustrated should be consideredexemplary and not limiting to the teachings herein. As an example, thethreaded, adjustable bolts 88 could be engageable to a support block 90or the like for the transfer conveyor 10 by engaging through thelaterally linearly aligned slots 74 in the terminal portions 72 of theend flanges 34, 35.

As further illustrated, the end nub 62 of the drive pulley 56 may beengaged by any suitable means such as belt or chain 90 to a hub 92 of anend roller 81 of one of the contiguous belts 80, so as to be driventhereby. This also is merely exemplary in nature as the belt can bedriven by other means, as understood by those skilled in the art, aswell.

As product passes from one to another of the belts 80 through use of thetransfer conveyor 10, they are animated in travel thereacross, avoidingbackups and the like and substantially maintaining all the productisolated to travel along the entire conveying dimension or width of thebelts 80 by the rising shoulders of drive sections 16 created by theflaring at the outboard drive sections 16 of the transfer conveyor 10.

FIGS. 8 to 10 show another form of the transfer conveyor. FIG. 8 shows acompletely assembled transfer conveyor 100. Transfer conveyor 100 has atransfer belt 101 with drive sections 105 at its opposite ends. Drivesections 105 have a circular cross section and an engagement surface 103having teeth on opposite sides of a guide land 104 extending outwardlytherefrom.

As shown by removal of transfer belt in FIG. 9, transfer belt 101 wrapsaround and slides over transfer plate 102 and as it moves articles onalong its upper surface. A central portion 117 is sandwiched between twotransition portions 116 that when all assembled together make uptransfer plate 102. Belt 101 and its drive sections 105 conform to theshape of transition portions 116 and central portion 117. By separatingtransition portions 116 from central portion 117 transfer belt 101 mayfirst be slipped over central portion 117 and then transition portions116 may be inserted into the belt and fixed to a central portion 117 byholes 118 that receive pins 119.

As shown by FIGS. 8 and 9 a drive roller 106 is fixed proximate each endof transfer plate 102 to drive the engagement surface 103 via teeth 107formed thereon on to each side of a groove 108 that receives land 104.Plate bracket 109 rotatable retains each drive roller 106 via a gearshaft 130 that extends to the outboard side of plate bracket 109. Screws127 extend through bracket holes 128 and engage threaded holes 129 atthe end of each transition section 116 to secure plate brackets 109 inplace about the ends of transfer plate 102. FIG. 8 shows an end view ofa drive shaft 113 extending through pulley 112 for synchronizing thetiming of drive pulleys 112 that are fixed about its outboard ends. FIG.9 shows drive shaft 113 removed from shaft hole 131 in central portion117 and shaft holes 132 in transition sections 116 through which itpasses to extend to each side of transfer plate 102.

Drive shaft 113 transmits rotation to drive rollers 106 via a drive belt133 that engages drive pulley 112 and driven pulleys 110 fixed at theoutboard ends of gear shaft 130. Plate brackets 109 may be fixed withrespect to any stationary object, in particular a main conveyor aspreviously described, to hold the transfer plate 102 in place withrespect to a main conveyor or other destination for or source ofconveyed articles. The drive shaft may be turned by any device that willrotate at the desired rate of revolutions. Electric drive motors ormechanical coupling to an end roller as previously described aresuitable ways of turning the input shaft at a desired rate. FIG. 9 showsthe total length of the transfer belt 101 with its transverse dimensionB which extends to the outside of transition sections 116 and itstransfer dimension A which in this case is shorter than the transversedimension B (but may be the same as the transverse dimension in otherarrangements as shown in FIGS. 11-18.)

FIG. 10 depicts transfer conveyor 100 positioned between two mainconveyors 119 and 122. The outermost edges 120 of the transfer conveyorextend almost to the beginning of the line 121 that indicates thetransition of conveyor belt 122 from a flat to a rounded surface createdby terminal roller 123. In this particular arrangement terminal roller123 is coupled to a roller pulley 124 that via a belt 125 turns an inputpulley 126 drive fixed to shaft 113 and keeps transfer belt 102 movingat the same speed as conveyor belt 122.

In FIG. 10 the transfer dimension C of the main conveyor 119 is the sameas the transfer dimension A of the transfer conveyor 100. FIG. 10 alsoshows how the conveyance distance along main conveyor 119 (i.e. thedirection of travel of the conveyor belt 122) is much greater than theconveyance distance across transfer belt 102.

FIGS. 11 to 14 show a transfer conveyor 150 which is another form oftransfer conveyor having a transfer belt 179 and a slide plate and atleast one captured roller as hereinafter described. The transferconveyor is suitable for positioning ahead and/or behind main conveyorsin the manner hereinbefore described. A cover assembly 152 located ateach end of transfer belt 179 covers the drive apparatus that receivesrotary input via the end of a drive shaft 180 that extends out of one orboth of cover assemblies 152 for moving the belt and conveying articles.Drive shaft 180 may be driven to impart motion to transfer belt 179 inany manner including those previously described.

FIG. 12 shows cover assemblies 152 in exploded view and separated from aremaining assembly 178 comprising the rest of transfer conveyor 150.Cover assemblies 152 include a pulley cover 176, shaft cap 175 andsupport bars 177. The driven end of drive shaft 180 extends throughholes in 154 and 155 in the respective shaft covers. FIG. 12 shows shaftcaps 175, pulley covers 176 and support bars 177 removed from assembly178 that contains transfer belt 179, slide plate 153, drive shaft 180,end plate 183 and drive rollers 181, 182. End plate 183 rotatablyretains drive shaft 180 and a shaft pulley 186 that turns drive roller181 via a drive pulley 188 fixed thereto and a belt 184. Drive pulley181 has teeth that engage corresponding teeth on an engagement surface191 of transfer belt 179 and also includes a land 192 that that fitsinto a corresponding groove 190 to maintain alignment of the transferbelt 179. As shown in FIG. 12 and FIG. 13 (FIG. 13 shows Section A-A ofFIG. 11), drive shaft 180 extends through transfer plate 153 to drivepulley 182 in a similar manner.

FIG. 14 shows, via Section B-B taken in FIG. 13, that drive roller 181acts together with a pinch roller 193 to keep drive roller 181 fullyengaged with engagement surface 191 of transfer belt 179. End plate 183rotatably retains pinch roller 193 in a slot or pocket defined by slideplate 153. Drive roller 181 and/or pinch roller 183 may be fixed withrespect to end plate 183; preferably at least one of these roller ormore preferable both of the rollers are biased toward the engagementsurface to increase the pressure thereon between these two rollers.

FIGS. 15 to 18 show another arrangement for the transfer conveyor to beused in the manner of the previously described transfer conveyors. Thistype of transfer conveyor locates or traps one or more of its rollers ina pocket defined by the transfer plate. In other examples of this typeof transfer conveyor rollers and corresponding pockets may extend fullyor partially across the transfer plate and may be located anywhere overthe surface of the transfer plate as long as the roller size andposition does not inhibit the close positioning of the transfer conveyorwith respect to an associated main conveyor.

Transfer conveyor 200 has a transfer plate 201 over which a transferbelt 203 (shown partially in FIG. 15) can slide and that has a driveroller 202 that extends across the entire transverse length oftransverse plate 201. The outer surface of drive roller 202 can contacttransfer belt 203 across its entire width. Drive roller 202 has teeth204 at both ends to engage an engagement surface on the transfer belt inthe manner previously described except that in this arrangement theengagement surface and its corresponding teeth extend around the insideof the transfer belt.

As shown in FIGS. 15 and 17, a groove 205 separates teeth 204 and alignswith a groove 206 that extends around the periphery of the transferplate at both of its ends. The groove receives a corresponding land onthe engagement surface of the transfer belt.

Adjustment plates 208 fixed to transfer plate 201 at both of its endsretains adjustment screws 207 in threaded holes to raise or lower shaftblocks 211 that rotatably retains drive shaft 210 to set the position ofdrive roller 202 with respect to the surface of transfer plate 201. Oneor more guide pins 210, fixed to each adjustment plate 208, extendthrough each shaft block and into a respective pin sleeve 209 tomaintain the alignment of the drive roller in a pocket 212 that extendsthe length of the transverse plate 201 and in which drive roller 202resides. In addition to positioning drive roller 202 with respect to thetop surface of transfer plate 201, extending or retracting theadjustment screw 207 moves drive roller 202 into or away from transferbelt 203 to increase or decrease its tension and can withdraw driveroller 201 completely out of contact with belt 203.

As shown in FIGS. 15 to 18 a tensioning roller 213 is retained in apocket 214 by shaft blocks 211′ that rotatably retain a tensioner shaft215 about which tensioning roller 213 turns. Pocket 214 opens to theopposite face of transfer plate 201 relative to pocket 212. Except foroperation as a tensioner, tensioning roller 213 functions in essentiallythe same manner and is positioned and retained in essentially the samemanner as drive roller 202. Some of its similarly functioning componentsinclude: adjustment plates and screws 207′ and 208′, shaft blocks 211′that retain tensioner shaft 215. Again raising or lowering adjustmentscrew 207′ with set the position of tensioning roller 213 with respectto the bottom surface of transfer plate 201 and increase or decrease thetension in transfer belt 203.

Transfer conveyor 200 may include one or more additional rollers thatare trapped in pockets and may extend fully or partially over the lengthof the transfer conveyor. The additional rollers may be drive rollers,tensioning rollers or rollers that simply reduce friction betweentransfer belt 203 and transfer plate 201. Preferably the transferconveyor will have at least one additional tensioning roller to provideadditional control on the tightness of transfer belt 203 about the slideplate. and may increase the engagement of the drive roller with thetransfer belt. Preferably at least one additional roller is alsoprovided on a surface of the transfer plate opposite a drive roller.

As depicted and described above, the transfer conveyor of this inventionprovides a number of advantages, some of which have been described aboveand others of which are inherent in the invention. Also, modificationsmay be proposed without departing from the teachings herein. Accordinglythe scope of the invention is only to be limited as necessitated by theaccompanying claims.

1. A transfer conveyor having a major axis and perpendicularly orientedminor axis comprising: a transfer plate having two belt guides spacedapart from each other in a parallel arrangement by a distance along theminor axis comprising a transport distance with the belt guides locatedon opposite sides of the transfer conveyor, each belt guide having anoutermost edge over its transverse length with transverse defined asextending along the major axis of the transfer conveyor, and thetransfer plate having a depth less than the distance between theoutermost edges; a continuous transfer belt suspended between the beltguides arranged for continuous travel over the belt guides and arrangedwith an upwardly oriented surface that provides a transport surface thatextends in a transverse direction to define a transversely extendingtransfer dimension across which articles may be conveyed with saidtransfer belt having a drive section located at at least one of itsends; and, at least one drive roller arranged to impart motion to thetransfer belt in the minor axis direction of the transfer conveyor,wherein the drive roller has a diameter greater than the outermost edge,is located closer to the center of the transfer surface than theoutermost edge and is in contact with an engagement surface that isfixed to or integral with the drive section of the transfer belt tocause the transfer belt to translate over the outermost edges forconveying articles across the transport surface.
 2. The transferconveyor of claim 1 wherein it bridges the gap to or from the terminalend of at least one main conveyor having a terminal roller at itsterminal end and arranged to convey articles for a greater distance thanthe transfer conveyor and having a conveying dimension that extends inthe same direction as the major axis and across which articles may beconveyed.
 3. The transfer conveyor of claim 1 wherein the transfer belthas a total length in its transverse direction that is greater than thetransfer dimension and has at least one drive section that extendsbeyond the transfer dimension and preferably beyond the belt guides. 4.The transfer conveyor of claim 2 wherein the drive section extendsbeyond the transfer dimension, the transfer dimension is at least equalto the conveying dimension of an adjacent main conveyor.
 5. The transferconveyor of claim 1 wherein at least one drive roller or at least oneengagement surface has a diameter greater than the thickness of thetransfer plate and at least a portion of the drive section extends abovethe transport surface.
 6. The transfer conveyor of claim 2 wherein thedrive roller causes the transfer belt to translate at a different speedthan a conveyor belt of the adjacent main conveyor.
 7. The transferconveyor of claim 1 wherein the length of the transfer belt in thedirection of its continuous travel is the same across the total lengthof the transfer belt.
 8. The transfer conveyor of claim 1 wherein theoutermost edge comprises a low friction material in the form of a smallradius nose and the radius of the nose is less than 25% of the thicknessof the transfer plate.
 9. The transfer conveyor of 1 wherein theengagement surface provides teeth that engage at least one drive roller.10. The transfer conveyor of claim 1 wherein the engagement surface isintegral with the drive section and circular in form.
 11. The transferconveyor of claim 1 wherein at least one pocket is formed by the end ofthe transfer plate and the pocket receives at least one roller,preferably a drive roller, positioned in the pocket for contact by itscircumference with the transfer belt or the engagement surface.
 12. Thetransfer conveyor of claim 1 wherein at least one drive roller engagesan engagement surface traversing the outside of the drive section. 13.The transfer conveyor of claim 1 wherein at least one drive rollerengages an engagement surface traversing the inside of the engagementsurface.
 14. The transfer conveyor of claim 1 wherein the profile of thetransfer plate at at least one drive section differs from the profile ofthe transfer plate over the section of the transfer plate that retainsthe belt guides and at a portion of the transfer plate is separable fromthe remainder of the transfer plate at location of the drive section.15. A low profile transfer conveyor for bridging a gap betweencontiguous ends of conveyor belts of a multi segment conveyor system,the transfer conveyor comprising a belt assembly including a continuousbelt and a mechanical assembly received within the belt assembly for usein producing motion of the continuous belt of the belt assembly, thebelt assembly comprising a low profile central section and outwardlyextended end having a circular cross section with the low profilecentral section extending along at least a portion of the width of theconveyor belts it is to bridge, and the mechanical assembly comprisingat least a base portion for supporting the continuous belt and at leastone drive roller that causes rotation of the continuous belt about thecircular cross section to translate the continuous belt over the lowprofile central section.
 16. The low profile transfer conveyor of claim15 wherein the belt assembly comprises outwardly flaring ends on eachside of the low profile central section of the belt assembly and atleast one of the outwardly flaring ends is separable from the lowprofile central section for sliding the continuous belt over the lowprofile central section.
 17. The low profile transfer conveyor of claim16 wherein the outwardly extending ends act as stop member shouldersalong end edges of the transfer conveyor for keeping product in linewith the low profile central section of the belt for transport from oneconveyor belt segment to another.
 18. The low profile transfer conveyorof claim 17 wherein the mechanical assembly carries along each side edgethereof a thermoplastic static nose piece with a laterally outwardlynarrowing lower outer peripheral edge.
 19. The low profile transferconveyor of claim 18 wherein the mechanical assembly has at least onedrive roller, located on each side of the drive belt that engages thecircular drive section of the belt to keep the belt moving uniformlyover its width across the low profile central section and a drive shaftconnects drive roller at opposite ends of the conveyor.
 20. The lowprofile transfer conveyor of claim 15 wherein at least one of the driverollers is in the form of a roller that defines a groove or a land andan engagement surface defines the other of a groove or land and thegroove and land are arranged to cooperate to the keep the continuousbelt positioned with respect to the low profile central section. 21 Thelow profile transfer conveyor of claim 15 wherein the transfer conveyoris fixed to a support for same extending between end supports of theconveyor segments it is to bridge.
 22. The low profile transfer conveyorof claim 15 wherein at least one drive roller is mechanically linked tomulti-segment conveyor system to keep the translational speed of thecontinuous belt equal to the translational speed of at least one belt inthe multi-segment conveyor system.
 23. The low profile transfer conveyorof claim 15 wherein the transfer conveyor is fixed to a support for sameextending between end supports of the conveyor segments it is to bridgewith an adjustable fastener arrangement that allows adjustment of theheight at which the transfer conveyor is positioned.
 24. A low profiletransfer conveyor for bridging a gap between contiguous ends of conveyorbelts of a multi segment conveyor system, the transfer conveyorcomprising a belt assembly and a mechanical assembly received within thebelt assembly for use in producing motion of the belt of the beltassembly, the belt assembly comprising a continuous belt having a lowprofile central section and outward cylindrically shaped ends with thelow profile central section extending substantially along an entirewidth of the conveyor belts it is to bridge, and the mechanical assemblycomprising at least a base portion for supporting the belt assembly, acircular engagement surface fixed around the cylindrical end of thebelt, and a drive roller that rotates the engagement surface for causingtranslation of the low profile central section of the continuous belt.